1.

The value of ""^(n)P_(1)+(""^(n)P_(2))/(2!)+(""^(n)P_(3))/(3!)+......+(""^(n)P_(n))/(n!)

Answer»

`2^(N)`
`2^(n)+1`
`2^(n)-1`
`2^(n-1)`

ANSWER :C


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